Oxychilus (Ortizius) navarricus helveticus (Blum, 1881), een nieuwe landslak voor de Nederlandse fauna (Gastropoda, Pulmonata, Zonitidae)

An apparently isolated population of Oxychilus (Ortizius) navarricus helveticus (Blum, 1881) was discovered in a nature reserve, a former poplar plantation on wet, base-rich soil in the province of Noord-Brabant. This represents the first confirmed occurrence in the Netherlands, after an old, unconfirmed and probably erroneous record. The habitat of the population, and the shell, external features and genital anatomy are briefly described. Attention is drawn to the fact that the Dutch specimens examined closely resemble drawings by Giusti & Manganelli (2002) of British specimens by their distinct, relatively coarse penial pilasters, rather than the wavy, thin pilasters connected by numerous lateral projections illustrated for Swiss and Cantabrian/western Pyrenean specimens.